1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * From: @(#)readdir.c	8.3 (Berkeley) 9/29/94
30 * From: FreeBSD: head/lib/libc/gen/readdir.c 314436 2017-02-28 23:42:47Z imp
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD$");
35
36#include "namespace.h"
37#include <sys/param.h>
38#define	_WANT_FREEBSD11_DIRENT
39#include <dirent.h>
40#include <errno.h>
41#include <stdbool.h>
42#include <stddef.h>
43#include <stdlib.h>
44#include <string.h>
45#include <pthread.h>
46#include "un-namespace.h"
47
48#include "libc_private.h"
49#include "gen-private.h"
50#include "telldir.h"
51
52#include "gen-compat.h"
53
54static bool
55freebsd11_cvtdirent(struct freebsd11_dirent *dstdp, struct dirent *srcdp)
56{
57
58	if (srcdp->d_namlen >= sizeof(dstdp->d_name))
59		return (false);
60	dstdp->d_type = srcdp->d_type;
61	dstdp->d_namlen = srcdp->d_namlen;
62	dstdp->d_fileno = srcdp->d_fileno;		/* truncate */
63	dstdp->d_reclen = FREEBSD11_DIRSIZ(dstdp);
64	bcopy(srcdp->d_name, dstdp->d_name, dstdp->d_namlen);
65	bzero(dstdp->d_name + dstdp->d_namlen,
66	    dstdp->d_reclen - offsetof(struct freebsd11_dirent, d_name) -
67	    dstdp->d_namlen);
68	return (true);
69}
70
71struct freebsd11_dirent *
72freebsd11_readdir(DIR *dirp)
73{
74	struct freebsd11_dirent *dstdp;
75	struct dirent *dp;
76
77	if (__isthreaded)
78		_pthread_mutex_lock(&dirp->dd_lock);
79	dp = _readdir_unlocked(dirp, RDU_SKIP);
80	if (dp != NULL) {
81		if (dirp->dd_compat_de == NULL)
82			dirp->dd_compat_de = malloc(sizeof(struct
83			    freebsd11_dirent));
84		if (freebsd11_cvtdirent(dirp->dd_compat_de, dp))
85			dstdp = dirp->dd_compat_de;
86		else
87			dstdp = NULL;
88	} else
89		dstdp = NULL;
90	if (__isthreaded)
91		_pthread_mutex_unlock(&dirp->dd_lock);
92
93	return (dstdp);
94}
95
96int
97freebsd11_readdir_r(DIR *dirp, struct freebsd11_dirent *entry,
98    struct freebsd11_dirent **result)
99{
100	struct dirent xentry, *xresult;
101	int error;
102
103	error = __readdir_r(dirp, &xentry, &xresult);
104	if (error != 0)
105		return (error);
106	if (xresult != NULL) {
107		if (freebsd11_cvtdirent(entry, &xentry))
108			*result = entry;
109		else /* should not happen due to RDU_SHORT */
110			*result = NULL;
111	} else
112		*result = NULL;
113	return (0);
114}
115
116__sym_compat(readdir, freebsd11_readdir, FBSD_1.0);
117__sym_compat(readdir_r, freebsd11_readdir_r, FBSD_1.0);
118